BaseActionWatcher.watch should provide a way to handle error

Currently method `BaseActionWatcher.watch` catches errors in an internal `try/catch` block and silently swallow the errors. It stops watching on any error without providing any chance to retry. It returns `undefined` in all cases :O, and all state properties are private so there's no way to handle errors from derived classes.

Start at the BaseActionWatcher.watch entry point and inspect its internal try/catch plus the private state properties mentioned in the issue. Define how errors should be exposed to derived classes and how retry behavior should work; done means errors are no longer silently swallowed and watching can be handled or retried.

Written by the indexing model from the issue text.